August weather forecast
Saint Peter Port, Guernsey

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A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor
A calm sunny day in Saint Peter Port, Guernsey, with ships docked at the harbor

Weather in August

August in Saint Peter Port, Guernsey carries forward the warm and pleasant weather conditions of July. There is a slight increase in rainfall to 41mm (1.61") over more days, suggesting the incipient easing of summer. However, with temperatures enjoying their peak and wind speeds remaining moderate, the weather conditions are still predominantly summery. Sea temperatures also reach their height, allowing for a range of water-related activities.

Temperature

Saint Peter Port registers the highest average temperatures during the month of August, with peaks of 17.8°C (64°F) and lows of 15.8°C (60.4°F).

Humidity

The average relative humidity in August is 82%.

Rainfall

In August, in Saint Peter Port, the rain falls for 14 days. Throughout August, 41mm (1.61") of precipitation is accumulated. Throughout the year, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.

Snowfall

February through December are months without snowfall.

Sea temperature

August is the month with the warmest seawater, with an average sea temperature of 17°C (62.6°F).
Note: In water of 17°C (62.6°F), the majority of people do not enjoy swimming. Breathing becomes increasingly hard to manage as the temperature drops from 21°C (69.8°F) to 15°C (59°F).

Daylight

In August, the average length of the day in Saint Peter Port, Guernsey, is 14h and 22min.
On the first day of August, sunrise is at 05:42 and sunset at 20:50. On the last day of the month, sunrise is at 06:25 and sunset at 19:55 BST.

Sunshine

In August, the average sunshine is 9.2h.

UV index

The months with the highest UV index in Saint Peter Port are July through September, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: The daily high UV index of 5 during August translates into the following recommendations:
Act with care - The need to guard against sun damage is communicated. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Boost your sun resistance with garments that are densely woven yet spacious.
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Frequently asked questions

What time of the year is the hottest in Saint Peter Port?

Saint Peter Port witnesses the warmest weather in August, with temperatures averaging a high of 17.8°C (64°F) and a low of 15.8°C (60.4°F).

What are the temperatures in Saint Peter Port in August?

The high-temperature in Saint Peter Port, Guernsey, during August is 17.8°C (64°F) and the low-temperature is 15.8°C (60.4°F).

What is the average humidity in August in Saint Peter Port?

In August, the average relative humidity is 82%.

How many days does it rain in August in Saint Peter Port?

In Saint Peter Port, Guernsey, in August, during 14 rainfall days, 41mm (1.61") of precipitation is typically accumulated.

When it does not snow in Saint Peter Port?

February through December are months without snowfall.

What is the month with the warmest sea water in Saint Peter Port?

With an average sea temperature of 17°C (62.6°F), August is the month with the warmest seawater in Saint Peter Port.

How cold is the water in August in Saint Peter Port?

In Saint Peter Port, Guernsey, in August, the average water temperature is 17°C (62.6°F). Swimming in 17°C (62.6°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the average length of the day in August in Saint Peter Port?

The average day length in August is 14h and 22min.

What time are sunrise and sunset in August in Saint Peter Port?

On the first day of August in Saint Peter Port, Guernsey, sunrise is at 05:42 and sunset at 20:50. On the last day of the month, sunrise is at 06:25 and sunset at 19:55 BST.

How many hours of sunshine does Saint Peter Port have in August?

The average sunshine duration in August in Saint Peter Port is 9.2h.

When is the highest UV index in Saint Peter Port?

The months with the highest UV index in Saint Peter Port are July through September, with an average maximum UV index of 5.

What is the UV index reading in August in Saint Peter Port?

In August, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in August
Saint Peter Port, Guernsey

Average temperature in August - Saint Peter Port, Guernsey
  • Average high temperature in August: 17.8°C

The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).

  • Average low temperature in August: 15.8°C

The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).

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Average pressure in August
Saint Peter Port, Guernsey

Average pressure in August - Saint Peter Port, Guernsey
  • Average pressure in August: 1016.4mbar

The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).

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Average wind speed in August
Saint Peter Port, Guernsey

Average wind speed in August - Saint Peter Port, Guernsey
  • Average wind speed in August: 22.8km/h

The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).

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Average humidity in August
Saint Peter Port, Guernsey

Average humidity in August - Saint Peter Port, Guernsey
  • Average humidity in August: 82%

The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).

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Average rainfall in August
Saint Peter Port, Guernsey

Average rainfall in August - Saint Peter Port, Guernsey
  • Average rainfall in August: 41mm

The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).

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Average rainfall days in August
Saint Peter Port, Guernsey

Average rainfall days in August - Saint Peter Port, Guernsey
  • Average rainfall days in August: 14 days

The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).

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Average snowfall in August
Saint Peter Port, Guernsey

Average snowfall in August - Saint Peter Port, Guernsey
  • Average snowfall in August: 0mm

The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in August
Saint Peter Port, Guernsey

Average snowfall days in August - Saint Peter Port, Guernsey
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

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Average sea temperature in August
Saint Peter Port, Guernsey

Average sea temperature in August - Saint Peter Port, Guernsey
  • Average sea temperature in August: 17°C

The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).

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Average daylight in August /
Average sunshine in August
Saint Peter Port, Guernsey

Average daylight in August / Average sunshine in August - Saint Peter Port, Guernsey
  • Average daylight in August: 14h and 2min

The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).

  • Average sunshine in August: 9h and 1min

The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).

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Average sunshine days in August
Saint Peter Port, Guernsey

Average sunshine days in August - Saint Peter Port, Guernsey
  • Average sunshine days in August: 12.1 days

The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).

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Average UV index in August
Saint Peter Port, Guernsey

Average UV index in August - Saint Peter Port, Guernsey
  • Average UV index in August: 5

The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).

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Average cloud cover in August
Saint Peter Port, Guernsey

Average cloud cover in August - Saint Peter Port, Guernsey
  • Average cloud cover in August: 40

The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).

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Average visibility in August
Saint Peter Port, Guernsey

Average visibility in August - Saint Peter Port, Guernsey
  • Average visibility in August: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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Saint Peter Port, Guernsey

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